A carbon filter is used to "scrub" air of, among other things, odor. The carbon filter is hooked to a vacuum, preferably a high output can fan(200 watts or so) and all air that is sucked through the fan, must first be pulled through a layer of carbon. My filter has about 12 and a half pounds of carbon stuffed into it, and works fairly decently. I'm already thinking of upgrading it, so I can stuff about 30 pounds or more in it. The carbon I used came from Ebay for around $50 for 27 pounds. Altogether, I probably paid $75 for a filter that could be sold for $135, maybe more. When I do make my 30 pound filter, it's cost will still be around $75, but worth about $180 or more according to the pro built ones. You have to make the carbon filter so large, as there is a lot of air restriction due to the carbon. So, increase the surface area by about, quadrouple or so, and it's like pulling air through a 5 or 6 inch in diameter duct. I was getting really worried recently that someone would take notice to the outdoor odor, which is why I built this thing asap. My neighbors are morons who have people drive by and buy drugs from their car window, and cops get called on them, and they call the cops all the time complainin about their baby's momma, blablabla, so, i was worried. I'm sorry I ramble....
KickYoAss Reviewed by KickYoAss on . carbon filter -making of Assembly of a homemade carbon filter. I used two 8"-6" reducers, a 6" and 8" plug, 12 screws, chicken wire, door screen, some aluminum foil tape, and a crapload of zip ties. Only thing left now is to fill it with carbon that I ordered, and hook it up to my 250 watt attic fan, wooooeeee. Materials cost around $25, 27 pounds of carbon for $49. Rating: 5